I am just curious how to go about setting up back heat. The way I have the flexwatt set up now on my rack it seems to not always make the shelves consistently heated. I thought about trying back heat. It seems to me that it would require turning up the thermostat to a much higher tempt. I assume that I would then place the thermometer probe on the back of the tub. This will make the back wall of the tub warm but does this really give them an effective place to curl up with warmth. I assume belly heat is the best thing for them, but with my current setup I am afraid the only way for consistency would be separate flexwatt for each shelf each with their own thermostat which is not really financially in the cards for me.